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Schedule of Revenues by Country (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
 [1],[2]
Oct. 02, 2016
 [2],[3]
Jul. 03, 2016
 [2],[4]
Apr. 03, 2016
 [2],[5]
Dec. 31, 2015
 [6],[7]
Oct. 04, 2015
 [8]
Jul. 05, 2015
 [9]
Apr. 05, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers $ 379,989 $ 410,475 $ 531,792 $ 430,994 $ 318,444 $ 465,994 $ 512,739 $ 342,401 $ 1,753,250 [10] $ 1,639,578 [10] $ 1,647,824 [10]
TAIWAN                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [10]                 653,076 436,389 495,942
UNITED STATES                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [10]                 221,948 217,386 213,104
CHINA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [10]                 174,876 264,898 292,145
KOREA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [10]                 147,882 120,224 145,608
JAPAN                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [10]                 135,978 128,228 63,761
Europe                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [10]                 117,671 111,903 111,043
MALAYSIA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [10]                 103,472 76,707 83,910
SINGAPORE                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [10]                 73,172 105,216 119,421
PHILIPPINES                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [10]                 54,705 96,103 68,662
THAILAND                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [10]                 43,097 59,104 44,117
Rest Of The World                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [10]                 $ 27,373 $ 23,420 $ 10,111
[1] Restructuring and other includes a $5.4 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[2] Teradyne recorded pension and post retirement net actuarial (gains) losses of $(1.2) million, $(0.7) million, $0.7 million and $(2.0) million for the first, second, third and fourth quarter in 2016, respectively. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[3] Restructuring and other includes an $8.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[4] Restructuring and other includes $4.2 million for an impairment of fixed assets, $0.9 million for expenses related to an earthquake in Kumamoto, Japan, and $1.4 million for the increase in the fair value of contingent consideration liability of which $0.8 million related to Universal Robots, and $0.6 million related to AIT, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
[5] Restructuring and other includes a $1.2 million fair value adjustment to increase the Universal Robots acquisition contingent consideration.
[6] In the fourth quarter ended December 31, 2015, Teradyne recorded pension and post retirement net actuarial losses of $17.7 million. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.
[7] Restructuring and other includes a $5.3 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and a $(0.3) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[8] Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[9] Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[10] Revenues attributable to a country are based on location of customer site.